I've been using the good Fel-Pro QVS13264T - PermaDryPlus Valve Cover Gaskets with good luck on different SB Fords for years. Just looking at Summit and my-o-my, they have become dearly priced at $34/pair. But they WORK!!!!

As far as skeeters and blood loss, ours are just starting to arrive from the nearby swampland along with the flying fangs, black flies